Home QoS QoS General Weighted RED (WRED)?

The WRED algorithm provides congestion avoidance on network interfaces by providing buffer management, and by allowing Transmission Control Protocol (TCP) traffic to throttle back before buffers are exhausted. This helps avoid tail drops and global synchronization issues, maximizing network usage and TCP-based application performance. WRED works by selectively dropping packets before congestion occurs, so it is considered to be a congestion avoidance feature.


  • WRED is a congestion avoidance mechanism, based on the adaptive nature of TCP traffic for congestion.
  • WRED allows for differentiated dropping behavior based on either IP precedenceor DSCP.
  • WRED is configurable in a CBWFQ policy-map.



Last Updated (Friday, 22 May 2009 18:19)

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